<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Jquery</title>
    <script type="text/javascript" src="js/jquery-1.7.1.min.js"></script>
    <script type="text/javascript">
		$(document).ready(function(){
			$('#button').click(function(){
				$('#sometext').addClass('bold');
			});
		});
    </script>
    <style type="text/css">
		.bold { font-weight: bold }
    </style>
</head>
<body>
	<p><input id="button" type="button" value="Apply class"/></p>
    <p id="sometext">This is some text</p>
</body>
</html>
